Sterilizable optical mouse

The mouse includes a circuit board having a position detecting unit for detecting the movement of the mouse, a switch for operating the mouse, and a wireless communication unit for wirelessly transmitting the data related to the movement detected at the position detecting unit and the data related to the operation of the switch to the outside. The circuit board and a power source are mounted on a bottom part. The bottom part is covered with a housing. Electronic devices including the circuit board, the power source, and other devices are accommodated in the internal space formed by the bottom part and the housing that have resistance to and strength against the change in pressure and temperature. The entire areas of the outer surfaces of the bottom part and the housing are covered with a resin cover having elasticity, heat resistance, and waterproofness. The cover seals the internal space formed by the bottom part and the housing. The electronic devices are enclosed with a heat insulating sheet.